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PMBR may refer to:

  • Preliminary Multistate Bar Review
  • protective master boot record, a boot sector on a hard disk with an MS-DOS-compatible format partition table embedded in it which also has a GUID partition table (GPT). Its purpose is to protect the disk contents from accidental damage by programs which properly interpret the MS-DOS-format partition table but do not interpret the GPT--for example, the fdisk program of both MS-DOS and Linux.